Central das Noticias

private class LoginAsyncTask extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... params) {

        String login = params[0];
        String senha = params[1];

        if (login.equals("") || senha.equals("")) {
            return null;
        }

        try{

            OkHttpClient client = new OkHttpClient();
            RequestBody formBody = new FormEncodingBuilder()
                    .add("login", login)
                    .add("senha", senha)
                    .build();
            Request request = new Request.Builder()
                    .url(Constants.LOGIN_URL)
                    .post(formBody)
                    .build();

            Response response = client.newCall(request).execute();
            return response.toString();

        }catch(Exception e){
            Log.d(Constants.TAG, e.getMessage());
        }
        return null;
    }

URL url = new URL(Constants.LOGIN_URL);
URL url = new URL("http://www.google.com.br");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("POST");
conn.addRequestProperty("Content-Type", "Content-Type:application/json");
conn.setReadTimeout(10000);
conn.setConnectTimeout(30000);

conn.connect();
return conn.getResponseMessage();